Insulating covering



June 6, 1933. L. WEBER INSULATING COVERING Filed March 29, 1929 EH15?webs Patented June 6, 1933 V y a 1 *UNITED STATES PATENT OFFICE a LOUISWEBER, or E'As'r crrrcneo, rnnninn i I INSULATING covnnme t Applicationfiled. March 29 1929. Serial No. 350,96

The present invention relates to improveadapted to withstandtemperaturesas high ments in heat insulating coverings, and has as 2000? F; withoutbreaking down, and in particular reference to high temperature inthepresent instance is made of a paste of sulating material adapted to beused as a mineral slag wool which has been driedat a 5 covering forpipes. 7 high temperature: to form a solid matrix The primary objects ofthe present inventhatrwillnot'shrink when againsubjected to tion are toprovide anew and improved inhlgh temperatures in use. The wall of thesulating material which will withstand high core, 10" maybe made of anysuitable thicktemperatures, and which is efiicient, light, inness butpreferably is made approximately 0 expensive, and easy to make and toapply. /gmch.m thickness. i r i A more specific object resides in thepro- The outenlayer 11 is made of a suitable vision of a novelinsulating covering, particheat lnsulatmg material, such as asbestos l ld t d f i hi h comprises a impregnated with a stifiening substance. In.relatively thin inner core of high temperatheipresentinstance, the layer11 consists of 15 ture insulating material, and an outer relaa p urahtyof alternating corrugated and tively thick ring or layer of lowtemperature plain substantially cylindrical plies 12 and i l ti t i l, 7I 13 of asbestos paper superimposed upon Still th bj t i t id a v l eachother and about the core 10 to form an covering of the above characterwhi h will outer annular air cell structure. Prefer- 20 not shrinkappreciably when subjected to y, he 131168 3 13 r t r and hi htemperatures i brought into superimposed relation by roll- Furtherobjects and advantages will bemg t-Wo strips of material tog 9 Q comevapparent as th d i ti proceeds, wh ch is corrugated and the other ofwhich is I th accompanying d i Fi 1 i plaln. It wlll be understood,however, that 25 a, perspective, iew of a, portion of a, coveranysuitable 21.1I' COIISlIlUCtlOIl 1113,3 be eming embodying thefeatures ofmy invention. p The P e 2 and 13 a held 9- Fig. 2 is a fragmentarylongitudinal sece y the etlttenlng ellbstflnee, m 111 tional view of thecovering taken along line k g the ye 11, the latter filmed 2 .2 fFi 1 ahigh temperature to take out shrlnkage.

While the invention is susceptible of varih layer 11 y be lnede of ydeemed ous modifications and alternative constructhlckness, e p one andone'helt fions, I h Shown i th d i d 111 lnches. Thetlnckness ofthe'core 1O preferherein describe in detail the preferred eml y 1SI'etemed eleptexlmetely e Sit-meter bodiment, but it is to be understoodthat I ttlttetent Outer layers 11 of Vetymg thlek' do not thereby intendto limit the invention neeeesl to the specific form disclosed, butintend to P y, h P X of the layer 11 Cover ll difi ti d lt r ti isincorporated in the matrlx of the core 10. structions falling within thespirit and scope The layer 11 yb bllltt about the core 1 f th i tiasiexpressed i th appended before the latter 1s dried to form the SOllCll i e core 10. The core 10 and the layer 11 may Referring morespecifically tothe drawing, be led tegethet the exemplary embodiment ofthe invention Preferably e C(Wermg 1e l t m comprises agenerallycylindrical body havas along 11116 S0 facllltate 1 ing an innercore 10 of high temperature inp ymg the verlng o a pipe (not shown).sulating material, and an outer layer 11 of To hold thesections otthecoverlng together relatively low temperature insulatingmateabout thep1pes, a sheet of suitable'material rial. 15, such as canvas duck, islapped about the The core 10, which is adapted to be placed dy Sections5 p directly against the heated surface to be in It will be evldent thatI have provided sulated, preferably is made of a dried paste a light,lnexpenslve, efficient andshrmkless 1190 insulating covering adapted toWithstand high temperatures. Air cell asbestos coverings and other lowtemperature insulating coverings are not adapted to safely Withstandhigh temperatures, for example above 400 F., but are very desirable inthat they are light and inexpensive. High temperature insulatingmaterial on the other hand is expensive and heavy, and when thick isliable to crack. By providing an insulating covering having a hightemperature insulating core inside of a relatively low temperatureinsulating layer the advantages of the loW temperature insulation areretained in a high temperature insulating covering. The core serves tokeep the temperature at the inside of the low temperature layer down toa point Where injury to the latter is prevented.

I claim as my invention:

A. cylindrical insulating covering comprising, an inner cylindrical coreof a dried paste of mineral slag W001 and adapted to Withstand hightemperatures up to approximately 2000 F., and an outer dead air celllayer of low temperature insulating material.

In testimony whereof, I have hereunto aflixed my signature.

LOUIS WEBER.

